Field photos
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- 1971
- Photos taken in the field, 1971.
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- 1972
- Photos taken in the field, 1972.
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- 1973
- Photos taken in the field, 1973.
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- 1975
- Photos taken in the field, 1975.
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- 1976
- Photos taken in the field, 1976.
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- 1981
- Photos taken in the field, 1981.
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- 2004
- Photos taken in the field, 2004.
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- 1971-1972
- Photos taken in the field, 1971-1972.
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- 1972-1973
- Photos taken in the field, 1972-1973.